#box2{
    width: 400px;
    height: 260px;
    display: flex;
    backface-visibility: hidden;
    background-image: url('../21.jpg');
    background-size: cover;
    background-position: center;
}
img{
    width: 800px;
    height: 490px;
    object-fit: cover;
    margin: 0 auto;
}